Incandescent electric lamp



(No Model.)

0 H MIGHAELSON INGANDESGENT ELECTRIC LAMP.

Patented June 14 INVENTOH @iWM WITNESSES 4 TTOHNEYS,

UNITED STATES ATENT FFICE@ OTTO II. MIOHAELSON, OF CHARLESTON, VEST VIRGINIA.

INCANDESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 605,498,1dated June 14, 1898. Application filed July 17,1897. Serial No. 644,953. (No model.)

To all whom it may concern.-

Be it known that I, OTTO H. MIcHAELsoN, of Charleston, in the county of Kanawha and State of Test Virginia, have invented a new and Improved Electric Lamp, of which the following is a full, clear, and exact description.

This invention relates particularly to incandescent lamps; and the object is to provide a lamp of this character in which the globe and its base may be separated for the purpose of cleaning or replacing a broken filament with a new one and then again assembling the parts; and a further object is to so construct the parts that a new filament may be readily inserted.

I will describe an electric lamp embodying my invention, and then point out the novel features in the appended claim.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indi cate corresponding parts in all the views.

Figure l is a side view of a lamp embodying my invention. section thereof. conductor having filament-clamping means and showing the same in its open position; and Fig. 4: is a similar view, but showing it in its clamping position.

The base of the lamp comprises a metal shell 1, in which is secured a base-piece 2, consisting of fictile materialsuch, for instance, as glass or porcelain-and having an annular groove 3 in its outer end, which forms a seat for a packing-ring 4 of suitable mate rial-such, for instance, as rubber. The basepiece 2 may be held in the'shell l by means of a suitable cement. Oonductor-wires 5 and 6 extend through the base-piece 2. The wire 5 projects through a ring'7, of insulating material, secured in the end of the shell 1 and engages with a metal ring 8 on the outer side of said insulating-ring 7, and the wire 6 engages -at its end with an interiorly-sorewthreaded ring 9, secured in the insulatingring '7. The rings 8 and 9 form contacts for the main lead-wires of a circuit.

I provide the projected ends of the conductors 5 and 6 with means for clamping the ends Fig. 2 is a longitudinal- Fig. 3 shows the end of a of a filament 10. As here shown, this means consists in splitting the ends of the conductors fora shortdistance, and these split ends may be forced tightly against the filament by means of a collar 11, movable on the conductor. In Fig. 4 I have shown the position of the ring when the end of the filament is clamped. The glass globe 12 is open at its end, and the wall of said open end is provided with an annular channel 13, forming a seat for the packing-ring 4.

In assembling the parts the ends of the filament 10 are clamped to the conductors 5 and 6, and then the base and globe are placed together, with the packing-ring 4 in its seat. The parts are then placed in an exhausting apparatus and the air exhausted from the globe 12. After exhausting the air the lamp is to be removed from the exhausting apparatus, and the parts will be held together by exterior atmospheric pressure. The lamp, however, may be opened at any time for the purpose of cleaning or replacing a filament by a sufficient bending pressure to separate the parts at the packingjoint. After the cleaning or replacing of a carbon the parts may be again put together as above described at a comparatively small cost.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In an incandescent lamp, a base of insulating material having an annular groove in its outer end, a metal shell in which the base is secured, conductor-Wires extended through the base-piece, a ring of insulating material in the shell, a metal ring on said insulatingring and with which one of the wires connects, a metal ringin the insulating-ring and with which the other wire connects, a globe having a channel around the wall of its open end, and a packing-ring engaging said channel and in the groove of the base, substantially as specified.

OTTO H. MIOIIAELSON. 

